Automatic valve control.



J. W. F. MACDONALD'.

AUTOMATIC VALVE CONTROL. APPLICATION FILED nic. 5. Isla.

Lwg@ Panama Apr. 8,1919.

I lll,

am 24?' I I I yl I I I O I Q y pansion of said orion.

rom: W. r.

MACDONALD, OF BRIGHTON, MASSACHUSETTS, ASSIGNOR TO THE MERRILL PROCESS COlllfPANY,y A CORPORATION OF MASSACHUSETTS.

AUTOMATIC VALVE CONTROL;

Lacasse.

Patented Apr. 8, 1919.

Application led December 5, 1918. Serial No. 265,387.

To all whom z' may concern:

Be it'known that 1, JOHN W. F. MACDON- United States, and a resident of Brighton, in the county of Suffolk and Stategof Massachusetts, have invented Improvements in Automatic Valve Controls, ofv which the following is a specification, reference being had to the accompanying drawings, forming part thereof.

l This invention has reference to an improved mechanism 'whereby the operation of valves may be'controlled by or through a variation in pressure of fluid caused by eX- luid 'by an increase of temperature, by mechanical pressure exerted on said fluid, or in any known manner. This application for patent 'is in part for subject matter disclosed inmy application filed February 8, 1918, Serial No. 216,142, on which Patent No. 1,278,068 was granted September a, 191s.

One object of this invention is to improve the construction of the mechanism which normally retains the valve actuating mem-A ber from operation.

Another object of the invention is to'so construct valve controlling mechanism of the nature herein described that a normally comparatively actuator element of the mechanism may be thermostatic expansion of duid acting against another element of said mechanism.

Other objects of the invention will appear `from the following' description.

The invention consists in the pressure actuated means and the balancing meansthere- The invention also consists in such other novel features of construction and combination of parts as shall hereinafter be more fullv described and pointed out in the claims. A -Figure 1, represents a sectional view of the improved nvalve controlling mechanism, as taken on line 1'4-1 Fig. 2.

' Fig, 2, representsa similar view Ataken on line 2,-2 Fig. ,1.

Similar characters of reference designate corresponding parts throughout. i. Y

As shown in the drawings 5 and 6 represent frame plates having perforations 7 and Sand spaced apart and secured on the bolts 9, 9. Plates high pressure acting against one 30 is pivotally 5 and 6 rspectively'have the chambers 10 and 11 furnished with the pipes 12 and 13 which may represent the pipes 18, 19 of my said patent or may be any pipes adapted to be filled with air, liquid or any other suitable fluid medium which in itself or through some additional means may be subjected to a variation in its pressure exerting tendency. Within the respective chambers'lO and 11 are mounted the bellows members`14 and 15 having the rigid heads 16 and 17 furnished with the inwardly extending stems 18 and 19 of diameters larger than the perforations 7 and 8, of plates 5 and 6, said stems 18 and -19 being connected bythe screw threaded rod 20 adapted to slide in said perforations 7 and 8 and having adjustable on its screw thread the nuts 21 and-22.

Extending from frame plate 5 is the bracket arm- 23 which carries .a pivot on which the arm 24 of lever-25 is mounted. Arm 24 acts against nut 21 with a pressure determined by the adjustment of weight 26 on arm 25 to balance or to partially balance the pressure exerted on head 17 of bellows member 15.

Depending from the lower pair of bolts 9, 9 between plates 5 and 6 is a frame having the lower member 27 ,and the slotted members 28, 29 of which member 28 has the bracket arm 30 and member 29 has the bracket arm 31. On a pivot of bracket arm mounted the lever 32 which extends through the slots of said members and at its upper portion has the hook or finger 33. On a pivot of bracket arm 31 is pivoted the counter-weighted retaining' which is engaged with the hook or linger 33 of lever 32; the swinging of lever 34 by its counterweight is or may be` limited by said pin or bearing 37 contacting with a wall of said hook lor finger 33 in coperation with the bearing of arm` 35 of retaining andrelease lever 34 against nut 22 depending lpon rov vision is made to swing. lever 32 downward,v

the adjustment of nut 22 on rod 20.

when released by the pin or bearing37, by means of 'spring 38 connected with said lever 32 and with the arm iixed on'said frame member 27. l

- At the lower portionof said frame memnut 21of rod 20 and extends the axially ber 27 is a vertical opening through which screw threaded guide member 39 having the shoulder 40 which guide member is secured in place by the nut 41 and, at the lower portion, said guide member 39 is secured to the valve chamber 42 havingA the valve seat 43 or any other suitable valve seat. Slidable in the bore or perforation of guide 39 is the rod 44 which atits upper end is pivotally connected with lever 32 and at its lower end has the valve 45 adapted to close against valve seat 43.

Various arrangement andspeciic uses of the parts shown may be made without changing the invention materially. For instance, pipe 13 and chamber 11 may be connected with a conduit'supplied with high pressure which acts against headA 17 of bellows 15, such pressure being balanced partially by weighted arm 24,-"25 acting against partially by pressure actm against head 16 of bellows 14 in cham er 10.v If the ratio of pressure in said chambers 10 and 11 varies sufliciently from the normal either by the -failure or reduction of pressure in chamber 11 or by an undue increase of pressure in chamber 10 the heads 16 and 17 with the stems 18 and 19 and ,rod 20 will be shifted in a direction whereby nntQQ will act to swing lever 35, 36 in a direction At0 release bearing pin 37 from hook 33 to permit the swinging of lever 32, by 4spring 38, to move ro 44 in the valve cV osing direction.

In some cases when it' is proposed to close valve 45 so ely Vby reason of a failure y of pressure in chamber 11 and pipe-13, the

bel o ws 14 and its head 16,` may be omitted. In other cases when it is desired to effect the,l closing of'valvel 45 thermostatically, by t e expansion of air or other expansible medium in chamber 10 supplied with heat from any source, bellows 15 and its head 17 may beomitted and weighted arm 24, 25 with, the counter alancing of normal fluctuations in pressure m chamber 10 being, in some'de ee, compensated for' by the counterweigli-ted arm '35 ofthe retaining and release lever 34 act@ mg agamst nut 22 of rod 20.

ile I have herein shown and described a somewhat specific embodiment` of this' perforated exteriorly invention it is not my intention thereby to limit the invention except as herein claimed;

Having thus described 'my invention I claim as new and desire to secure by Letters Patent-` 1. Valve controlling means comprising a valve'actuating lever, a pivoted weighted means to retain said lever from operation, a slide rod, to actuate said means, having heads, and pressure chambers'in which said heads operate.

2. Valve controlling means comprising a valve actuating lever, a pivoted means to retainy said lever from operation, a slide rod' having heads, a pair of chambers in which said heads operate, adjustable means on said rod to act on said pivoted means, and a pivoted counterweight lever acting to move said slide rod in rone direction.

3. Valve controlling means comprising al valve actuating lever, a pivoted means to retain said lever from operation, a slide rod having a head, a pressure chamber in said head may operate, and a counterwelght adj ustable'n said rod against which a member of -said retaining lever acts.

5. Valvevcontrollingme'ans comprising a frame carrying a' guide, a valve rod slidable in said guide, a spring actuated lever ivotally mounted in'v said frame and havlng a ook, a counterweighted lever pivotally mounted on a member of said frame and having a pin normally in engagement with said hook, a pair of pressure chambers mounted at the upper portion of said a screw threaded rod slidable in openlngs of the walls of said chambers and having, within said, chambers, bellows having heads nuts adjustable' on the screw thread of sai rod, one said nut acting against a `member of said counterweighted lever, and a counterL weighted 4lever pivotally mounted at the upper portion Vof said frame and acting frame, 

